5x^2=3.6+4.7x

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Solution for 5x^2=3.6+4.7x equation:


Simplifying
5x2 = 3.6 + 4.7x

Solving
5x2 = 3.6 + 4.7x

Solving for variable 'x'.

Reorder the terms:
-3.6 + -4.7x + 5x2 = 3.6 + 4.7x + -3.6 + -4.7x

Reorder the terms:
-3.6 + -4.7x + 5x2 = 3.6 + -3.6 + 4.7x + -4.7x

Combine like terms: 3.6 + -3.6 = 0.0
-3.6 + -4.7x + 5x2 = 0.0 + 4.7x + -4.7x
-3.6 + -4.7x + 5x2 = 4.7x + -4.7x

Combine like terms: 4.7x + -4.7x = 0.0
-3.6 + -4.7x + 5x2 = 0.0

Begin completing the square.  Divide all terms by
5 the coefficient of the squared term: 

Divide each side by '5'.
-0.72 + -0.94x + x2 = 0.0

Move the constant term to the right:

Add '0.72' to each side of the equation.
-0.72 + -0.94x + 0.72 + x2 = 0.0 + 0.72

Reorder the terms:
-0.72 + 0.72 + -0.94x + x2 = 0.0 + 0.72

Combine like terms: -0.72 + 0.72 = 0.00
0.00 + -0.94x + x2 = 0.0 + 0.72
-0.94x + x2 = 0.0 + 0.72

Combine like terms: 0.0 + 0.72 = 0.72
-0.94x + x2 = 0.72

The x term is -0.94x.  Take half its coefficient (-0.47).
Square it (0.2209) and add it to both sides.

Add '0.2209' to each side of the equation.
-0.94x + 0.2209 + x2 = 0.72 + 0.2209

Reorder the terms:
0.2209 + -0.94x + x2 = 0.72 + 0.2209

Combine like terms: 0.72 + 0.2209 = 0.9409
0.2209 + -0.94x + x2 = 0.9409

Factor a perfect square on the left side:
(x + -0.47)(x + -0.47) = 0.9409

Calculate the square root of the right side: 0.97

Break this problem into two subproblems by setting 
(x + -0.47) equal to 0.97 and -0.97.

Subproblem 1

x + -0.47 = 0.97 Simplifying x + -0.47 = 0.97 Reorder the terms: -0.47 + x = 0.97 Solving -0.47 + x = 0.97 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.47' to each side of the equation. -0.47 + 0.47 + x = 0.97 + 0.47 Combine like terms: -0.47 + 0.47 = 0.00 0.00 + x = 0.97 + 0.47 x = 0.97 + 0.47 Combine like terms: 0.97 + 0.47 = 1.44 x = 1.44 Simplifying x = 1.44

Subproblem 2

x + -0.47 = -0.97 Simplifying x + -0.47 = -0.97 Reorder the terms: -0.47 + x = -0.97 Solving -0.47 + x = -0.97 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.47' to each side of the equation. -0.47 + 0.47 + x = -0.97 + 0.47 Combine like terms: -0.47 + 0.47 = 0.00 0.00 + x = -0.97 + 0.47 x = -0.97 + 0.47 Combine like terms: -0.97 + 0.47 = -0.5 x = -0.5 Simplifying x = -0.5

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.44, -0.5}

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